AB = 10 → C and BC = 10 → A
to calculate the lengths use the distance formula
d = √ (x₂ - x₁ )² + (y₂ - y₁ )²
with (x₁, y₁ ) = (- 3, - 4) and (x₂, y₂ ) = (5, 2 )
AB = √(5 + 3 )² + (2 + 4 )² = √(64 + 36 ) = √100 = 10 → C
with (x₁, y₁ ) = (5, 2 ) and (x₂, y₂ ) = (11, - 6 )
BC = √(11 - 5 )² + (- 6 - 2 )² = √(36 + 64 ) = √100 = 10 → A